Discharging device for rotary cylinders



April 5 1927.

A. c. DEER I DISCHARGING DEVICE FOR ROTARY CYLINDERS Fi led Nov. 20, 1925 Patented Apr. 5, 1927.

UNITED STATES -ATLEE CLYDE DEER, or CHATTANOOGA, TENNESSEE.

vnrscrmnenve DEVICE non norAnY CYLINDERS,

Application fil ed November This invention relates to improvements in discharge devices for rotary driers, kilns, and the like, where it is essential or desirable that the interior of'thedrier or kiln shall be shut off from the atmosphere at all times.

This apparatus is intended for drier-s, kilns, furnaces, etc, of the rotary type, such as those employed in expelling moisture from limestone, clay or other materials or treating the same thermally as in burning cement clinker, etc., which will hereinafter be termed driers It is well known that in the use of such driers with boiler gases or chemically active gases, that for reasons of draft, the comfort and safety of the personnel, and for avoiding losses of heat, the interior of the drier must be shut off from the atmosphere.

Heretofore such devices have been provided with discharge devices which delivered into a receptacle which could be maintained covered, and which was emptied from time to time at irregular intervals by the attendant; or the contents have been discharged directly to the atmosphere in as brief a space of time as possible. In the first case, leaks present about the joint between the cylinder and the receptacle permitted the passage of gases; and in the second case, no attempt was usually made to prevent such flow of gases while discharging.

According to the present invention the end of the rotary cylinder of the drier, kiln, or the like, hereinafter referred to as a. drier, is provided with a series of peripherally arranged doors which are held normally "closed, and are opened in succession as the corresponding part of the cylinder is at the bottom. These doors permit the discharge of the material from the interior of the cylinder to an annular chamber surrounding the same, fromwhich a second series of similar doors permit the discharge to the atmosphere. By virtue of this invention, the doors are so disposed and actuated that a door of either series is only opened when all doors of the other series-are closed; and in thisway no direct communication between the interior of the cylinderand the atmosphere is ever afforded. i

In the accompanying drawings: Figure lis a side. elevation of the rotary cylinder of such a drier, with a portion broken away on line 11 of Fig. 2.

Fig. 2 is an end view of the discharge de- 20, 1925. Serial No. 70,281.

vice with indicated.

The rotary cylinder 10 of the drier has a portions of the drier cylinder [feeding worm orlike device 11 at one end and the dlscharge mechanism at the opposite end. It will be understood that it is customarvto mount such a cylinder in an inclined direction upon rollers not shown,

and to rotate it by a suitable means at a sub-c stant-ially uniform rate of'speed, in a counterclockwise direction, as shown by the arrow in Fig. 2.

The rotary cylinder is closed at the discharge end by a plate 12 having the gasconnection 13 through which gas maybe admitted orwithdrawn, as will be understood by those versed in the art. On the periphery of the cylinderadjacent this plate are formed the pockets 14: which receive the material after passing through the cylinder.v Each of these pockets 14 has a door 15 associated therewith, pivotally mounted upon the cylinder structure and solidly fastened to a shaft 16. Each of these shafts passes outward and is, supported at the end in a frame 17 attached to the rotary cylinder. A crank arm 18 is solidly connected to each of these shafts and bears at its free end a roller 19 and carries one end of the individual door closing spring 20, the other end of the latter being connected to a suitable stud 20 of the casing. Each door serves to close the aperture in the respective pocket.

Joined to and forming a sealed joint with the rotary cylinder is a conical casing 21 which has a stiffening partition 21 which terminates beyond the end of the cylinder from through the respective door 24 as the latter reaches the bottom position.

The movement of the series'of doors 15 and 24 is accomplished by means ofthe respective cams 29 and 30 which are attached to the standard 32 which supports the rotary til cylinder. It will be noted in Fig. 2 that the relative positions of the two series of doors and 24, and their respective cams, is such that. when four doors are utilized in each series, spaced ninety degrees apart in each series, the point of opening of a door in one series is forty-five degrees after the opening of the next preceding door in the other series; and that each door closes less than fortyfive degrees after its opening. In this way, notwo doors are open at the same time in the illustration shown.

Ihe operation of the device is obvious. As the cylinder revolves, the roller 19 on one of the shafts 16 encounters the cam 29, and the shaft is thereby rocked to open the door 15, so that the material in the pocket 14: is discharged into the annular chamber 22. After a further rotation of say forty degrees, the roller 19 leaves the cam 29, and the door closing spring 20 returns the door 15 to the closed position. Shortly thereafter the roller 27 encounters the cam 30, and the shaft is rocked to open the door 24 and permit the material in the pocket 23 to be discharged to the atmosphere. About forty degrees of rotation thereafter, the roller 27 leaves the cam 30, and the door Bet is closed by its return spring 28. This action repeats itself for each door in each series as it reaches the bottom. 7

The device is especially adapted for hightemperature driers or roasters, and for those in which offensive gases are to be kept out of the working room where the cylinder is located.

It is obvious that the device may he modified within the scope of the appended claims.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent is:

1. In a drier, a rotary cylinder having a plurality of doors at its discharge end, each of said doors serving to establish when open a free communication from the inside to the outside of said cylinder, a casing surrounding the doors at the discharge end of the drier having a plurality of doors therein. each of said doors serving to establish when open a free communication from the inside to the outside of said casing, and means to successively open and close said doors so that a door of one of said pluralities is opened while'all the doors of the other plurality are closed.

2. In a drier, a rotary cylinder, a closed receiving chamber at the discharge end of the drier attached thereto for rotation'therewith, a first plurality of doors closing the communication between said cylinder and said chamber, a second plurality of doors closing communication between said chamber and the atmosphere, means to open and close doors of said first plurality at intervals, each of said doors serving to establish when open a free communication from the inside to the outside of said cylinder. and means to open and close doors of the second plurality, each-of said doors serving to estab lish when open a free conununication from the inside to the outside of said casing during the closed intervals of said first plurality.

3. In a drier. a rotary cylinder, a closed receiving chamber at the discharge end of the cylinder and connected to rotate with the cylinder, a first plurality of doors closing the communication between said cylinder and said chamber and spaced at regular intervals about the axis of said cylinder, at second plurality of doors closing the communication between said chamber and the atmosphere and likewise spaced at regular intervals about the axis of the cylinder and located in staggered relations to the doors of said first plurality. means to open doors of said first plurality, when in dumping position, each of said doors serving to establish when open a free communication from. the inside to the outside of said cylinder, means to open doors of second plurality when in dumping position, each of said doors serving to establish when open a free communication from the inside to the outside of said casing, and means to maintain the doors of each plurality closed while a door of the other plurality is open.

4. In a drier, a rotary cylinder having a plurality of pockets at the discharge end, each of said pockets having a radial aperture, a closing door for each of said apertures, a spring to hold said door in normal closing relation to its respective aperture, a closed casing attached to the cylinder and surrounding said doors and adapted to receive material discharged through said doors and having a plurality of pockets thereon, each of the latter pockets having a radial aperture, a closing door for each of said latter apertures, a spring to hold each of said latter doors in normal closing relation to its respective aperture, a first cam located on the cylinder standard and disposed to open one of said first closing doors as it reaches the dumping position for the respective pocket and permit closure thereof before the succeeding latter pocket reaches its dumping position, and a second cam located on the cylinder standard and disposed to open one of said second closing doors as it reaches the dun'iping position and permit the closure the eof before the succeeding first pocket reaches its dumping position.

In testimony whereof, I aflix my signature.

ATLEE CLYDE DEER. I 

